Question

the process of photosynthesis enables plants to sustain themselves by creating
a glucose.
b chlorophyll.
c water vapor.
d carbon dioxide.

Explanation:

Photosynthesis is a process where plants use sunlight, carbon dioxide ($CO_2$), and water ($H_2O$) to produce glucose ($C_6H_{12}O_6$) and oxygen ($O_2$). Chlorophyll is a pigment in plants that helps in capturing light energy, not the end - product of photosynthesis for sustenance. Water vapor is released during transpiration (a different process from photosynthesis for the question's context). Carbon dioxide is a reactant in photosynthesis, not the product for the plant's sustenance.

Answer:

A. glucose